nloader | dcb029418fd909a3ff32dce12580d4f09a1e49367b6295032b2fc9d94c3e4de4

General

Target

subscription_1616715716.xlsb

Score

10^/10

nloader loader upx

Malware Config

Signatures

Nloader
Simple loader that includes the keyword 'cambo' in the URL used to download other families.
loader nloader

Process spawned unexpected child process 1 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

cmd.exe

description	pid	pid_target	process	target process
Parent C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE is not expected to spawn this process	2988	500	cmd.exe	EXCEL.EXE

ACProtect 1.3x - 1.4x DLL software 2 IoCs

Detects file using ACProtect software.

Processes:

resource	yara_rule
C:\Users\Public\12394.fl5	acprotect
\Users\Public\12394.fl5	acprotect

Nloader Payload 1 IoCs

Processes:

resource	yara_rule
behavioral2/memory/3924-14-0x0000000010000000-0x0000000010005000-memory.dmp	nloader

Blocklisted process makes network request 2 IoCs

Processes:

rundll32.exe

flow pid process

21 3924 rundll32.exe
31 3924 rundll32.exe

flow	pid	process
21	3924	rundll32.exe
31	3924	rundll32.exe

UPX packed file 2 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
C:\Users\Public\12394.fl5	upx
\Users\Public\12394.fl5	upx

Loads dropped DLL 1 IoCs

Processes:

rundll32.exe

pid process

3924 rundll32.exe

pid	process
3924	rundll32.exe

Checks processor information in registry 2 TTPs 3 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	EXCEL.EXE

Enumerates system info in registry 2 TTPs 3 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemFamily	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

500 EXCEL.EXE

Suspicious use of SetWindowsHookEx 12 IoCs

Processes:

EXCEL.EXE

pid	process
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE
500	EXCEL.EXE

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

EXCEL.EXEcmd.exerundll32.exe

description	pid	process	target process
PID 500 wrote to memory of 2988	500	EXCEL.EXE	cmd.exe
PID 500 wrote to memory of 2988	500	EXCEL.EXE	cmd.exe
PID 2988 wrote to memory of 4088	2988	cmd.exe	certutil.exe
PID 2988 wrote to memory of 4088	2988	cmd.exe	certutil.exe
PID 2988 wrote to memory of 4056	2988	cmd.exe	rundll32.exe
PID 2988 wrote to memory of 4056	2988	cmd.exe	rundll32.exe
PID 4056 wrote to memory of 3924	4056	rundll32.exe	rundll32.exe
PID 4056 wrote to memory of 3924	4056	rundll32.exe	rundll32.exe
PID 4056 wrote to memory of 3924	4056	rundll32.exe	rundll32.exe

C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE
"C:\Program Files\Microsoft Office\Root\Office16\EXCEL.EXE" "C:\Users\Admin\AppData\Local\Temp\subscription_1616715716.xlsb"
1⤵
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:500

C:\Windows\SYSTEM32\cmd.exe
cmd.exe /c certutil -decode %PUBLIC%\12394.xps %PUBLIC%\12394.fl5 && rundll32 %PUBLIC%\12394.fl5,DF1
2⤵
- Process spawned unexpected child process
- Suspicious use of WriteProcessMemory
PID:2988

C:\Windows\system32\certutil.exe
certutil -decode C:\Users\Public\12394.xps C:\Users\Public\12394.fl5
3⤵
PID:4088

C:\Windows\system32\rundll32.exe
rundll32 C:\Users\Public\12394.fl5,DF1
3⤵
- Suspicious use of WriteProcessMemory
PID:4056

C:\Windows\SysWOW64\rundll32.exe
rundll32 C:\Users\Public\12394.fl5,DF1
4⤵
- Blocklisted process makes network request
- Loads dropped DLL
PID:3924

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Public\12394.fl5

MD5
5e61a7988375efe18897ff264b7c81b8

SHA1
8a487c189edd6e3cc32cee7709aa4e0c21d07491

SHA256
7aa4cb052ddfbccac10bdfeae585f15fa4bfbeadea5ece649234fcbc9fec2955

SHA512
14e3a48cad4e4d5ba848a793fd304dec5416a6652394241db91d7d029b205e252bf3d3c77dafe4a587a4748d6a558ba7ec3d417d211b6f58fc00b794ed7eb788

Download Submit
C:\Users\Public\12394.xps

MD5
8bd77cfc1367b015ae4b41271ef0f917

SHA1
d406dd185e1d2eb7a40d41818202a3e37192dc93

SHA256
27f6411f25ea347e2a6ad3a220f4be92fa57ed09bcc7f3098376dc9d12586b08

SHA512
58de781827db0cdd6ed4f1f11c02be1babc19787c0d79a4fae9ecb5a93c84fdb8bb239e7b2e90248b6f8d81213326aef535244024485b7bd46da61bd7f82c018

Download Submit
\Users\Public\12394.fl5

MD5
5e61a7988375efe18897ff264b7c81b8

SHA1
8a487c189edd6e3cc32cee7709aa4e0c21d07491

SHA256
7aa4cb052ddfbccac10bdfeae585f15fa4bfbeadea5ece649234fcbc9fec2955

SHA512
14e3a48cad4e4d5ba848a793fd304dec5416a6652394241db91d7d029b205e252bf3d3c77dafe4a587a4748d6a558ba7ec3d417d211b6f58fc00b794ed7eb788

Download Submit
memory/500-5-0x00007FFA91E20000-0x00007FFA91E30000-memory.dmp

Filesize
64KB

Download
memory/500-6-0x00007FFAB5A30000-0x00007FFAB6067000-memory.dmp

Filesize
6.2MB

Download
memory/500-2-0x00007FFA91E20000-0x00007FFA91E30000-memory.dmp

Filesize
64KB

Download
memory/500-4-0x00007FFA91E20000-0x00007FFA91E30000-memory.dmp

Filesize
64KB

Download
memory/500-3-0x00007FFA91E20000-0x00007FFA91E30000-memory.dmp

Filesize
64KB

Download
memory/2988-7-0x0000000000000000-mapping.dmp

Download
memory/3924-12-0x0000000000000000-mapping.dmp

Download
memory/3924-14-0x0000000010000000-0x0000000010005000-memory.dmp

Filesize
20KB

Download
memory/4056-10-0x0000000000000000-mapping.dmp

Download
memory/4088-8-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads